public class StringDemo6 {
    public static void main(String[] args) {
        String s = "a";// 字符串必须用双引号
        String s1 = "1";// 字符串类型1
        int i1 = 1;// 数字的1
        long l2 = 100L;
        System.out.println(s1 + i1+l2);
    }
}
